I think it's really interesting how anti-smoking this thread is. I'm guessing that most of the people who've replied live in America, because over here in England it feels like it's more tolerated.

All I'd say about this subject (and I don't smoke) is that spending your days in a room with someone who is smoking is pretty bad for your health, but I'm not sure that secondary smoke in a restaurant or out in the street causes that much damage? Correct me if I'm wrong, but I can't help but feel like car and industrial pollution and a poor diet will do you more harm than the occasional bit of secondary smoke...